Yea I heard of people getting transfusions between stages at the tour. Transfusions must be a more extreme increase in blood cells than high altitude training. Im more just curious if anyone has failed because of high altitude training. More or less just thinking out loud at this point haha.

Could high altitude training be considered doping? I was watching a doping documentary the other day and they mention testing blood cell count in it. Just curious. Sorry if its a dumb question, just curious.